We went today - it's a damn good zoo. Baffling layout, but good enclosures, happy looking animals, lots to see, lots of good educational/conservation info, displays and activities. The food was uninspiring but at least lots of places to go, and it was all very clean. And there are loads of nice picnic places if you're more organised than me. Plus, if you book your tickets online you get fast-tracked in and a discount.